const {createGzip,createDeflate} = require('zlib');
module.exports = (rs, req, res) => {
    const acceptEncoding = req.headers['accept-encoding'];
    if(!acceptEncoding || !acceptEncoding.match(/\b(gzip|deflate)\b/)){
        return rs;
    }else  if(acceptEncoding.match(/\bgzip\b/)){
        res.setHeader('Content-Encoding','gzip');
        return rs.pipe(createGzip());
    }else  if(acceptEncoding.match(/\bdeflate\b/)){
        res.setHeader('Content-Encoding','deflate');
        return rs.pipe(createDeflate());
    };
};